Mold for forming repair patches



May `8', 1923.

4 1,454,655 J. ROBERTSON, JR

MOLD Fon FORMING REPAIR PATGHES s spesa-sheet 1 Filed Feb.) 15, 1922 Fig. 4.'

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May s, 192s. .1,454,655

J. ROBERTSON, JR MOLD Foa FORNI-NG REPAIR PATCHES FiledlFeb. 15. 19:22l s shetegg-sheets gw v E l .v I L, 26

23 v Fig. 6.

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:I7 i r s '5 al; n4 o a 2 IO I3 f Inventorr 'a, %//f\\\ James Robertson, Ir.;

Alton-Leyl J. ROBERTSON. .may

MOLD FOR FORMING REPAIR PATCHES Filed Feb. 15, 1922 s sheets-sheet 1 I y Inventor,

James Robertson, jr.

Homey.

Patented May 8, 1923.

U N l 'l E D S T T 5 Moinnrof roaming narnia raronns. i

errlieetien filer1 February 1.5; ,192e-Y ,Seiiel Ne- 5313.559.,

.T ,0 all 107mm tmcty @onderw Be it .entre that l, JeMee Reeeereeef, .Jra etzen et the .United .Stetee ef Ameree, and a resident of Weehawlren, in the county of Hudson and lSta-te of New Jersey, have invented certain new and useful Improvements in Molds for Forming Repair Patches, of which the following is a specication.

The object of this invention is to provide a. inold suitable :for forming rubber repair patches for the heel or toe of rubber footwear such as is set forth in my Reissue Pattent No. 15,201 granted September 20, 1921. Therepair patch has a tread portion and, a

' flexible and elastic flange upstanding from one side or the tread portion. The flange is of one piece with the tread portion, is thin at the line of juncture with the tread portion, and it joins to the tread portion in such manner as to make a sharp corner particularly on its outer or convex side. A flirther object is to pro-vide a Inold of such form that it can be nsed so that the plastic rubber will be suthcientlyorced into the portion where the flange is molded as well as throughout the portion where lille tread is molded whereby a completejand perfect artijcle is insured. iA, further object is to provide a inold of snch form and'in which the joints are so vdisposed that the lins Vfrom the molded article -in the joints will not inten ere with the ready separation .ofthe inold y parte, and the .fine will be ee Clepeeeel .that vthey can be readily triinniedawily Without disliguring the article.

.In lthe eeeempenymg three ASheets f draw me'. wheh term e here ef this eiieeieeten. the several par-ts of a inold ,embodying this invention are illustrated, in which-,.-k

Figure 1 is a perspective of the top plate,

Figs. 2 land 3 are perspectives of the laterally separable parts of the- Inold, andA Fig. l is a perspective of the bottoinplate.

Figs. 5 and 6 are respectively `edge and under views of the tOp plate breken alway- Fig- 7 ie e plan ef the laterally separable parte and the better@ plete .eeeemblefl feed broken a-Wey- Fig. 8 is a vertical section throngh the .as-

sembled .meld .en elle .lire Will-fillet Fig. e7. I

Fig. 9 is a vertical section through the assembled inold on line 11K-IX of Fig; 7 .e

is a perspective ota hydraulic l steam plate press with ino-lds charged with plastic robber. i' i rllhe niold lies partly in each of two latr .erally separable parts 1Q, 11 which are in the form of bars and it is preferably repeated a number of tiniesl along the length of' the bars. 'When the partsare togethera recess12 is forined for each inold which lies partly in the top face of each bar. Irlhis recess corresponds in outline and depth to the tread of the repair patch. Along thev side of one of the laterally separable parts is a projection 13 for each mold. Thisp'rojection underlies the recess forfthe tread of the repair patch and is conven inboth vertical and horizontal section. Along thelower edge of this projection is a shoulder ll which `defines the margin lof the upstanding flange of the repair patch. On the opposing farce of the other of the laterally separable parts is a recess 15 for each '..This recess underlies the recess for the tread of the repair patch and is concave in' both vertical land horizontal section, lts wall rneets the under wall of ythe recess for the treadmat a .Sharp .edge-1.6 .the perten ef the meld which carries this edge is of a durable inateriall as steel which is capable ofhol'ding the .edge endroit @hippies lt, ie eenvene'etly provided by ,e2 steel feena .17 fel" the errer leert .ef the .elle .ef the latere-ll. eereelele parts which carries fthe edge. ther parts 'of the moldy are ,conveniontly` of la more ,easily machined" material as .cast iron'or eliminen .The laterally .separable Perte when breuglit tegether are Properly reel- .tieeeel with reepeet .te eeeh other by eleWel iii-.lie le, 18, .enel ,the parte 'here' longitudine-l grooves 119, 19 in ytheir xunder Vsides so that when placed on ya bottom plate 20 with lon- ,etednel ribs 2,1, 2.1. elle rlee will .engelse the sreeree and keer .the laterally eereffeble perte ifremhens .ferfeed enelt .br .the Preesure ol vthe inatlerial in the rnolds, trop plete 22. 22. 'ie leid .ever the laterally eene- 'felele parte teeeeerlete .the eeelel eefl ie refer tiened ley ldeivele 2.3,' erteee 2e., 2y-l ef the speler' ieee ',Wleiele .eene erreete elle re cesses for the tread portions in the molds each have two intersecting series of parallel grooves cut therein thereby leaving projecting points so that a. roughened face will be molded on the treadv portion of each repair patch. Overflow grooves 25, 25 adjoin the joints of the molds to receive any excess material over what is needed for the article and which forms the slight fins in the joints. Spaced tongues 26, 26 and recesses 27, 27, are provided to enable the parts vto be more readily separated by the insertion of a tool between or into them.

In molding the repair patches all parts of the mold are suitably lubricated, the laterally separable parts are brought together and laid on the bottom plate and a suflicient mass of plastic rubber composition is placed in the recess for molding each tread portion. The top plate is then laid on but does not close 4fully on account of the underlying masses of plastic rubber. The charged molds are then placed between the jaws of a steam-plate press and while all of the parts are brought to a proper temperature a sufficient pressure is applied to close the molds and force any excess of inaterial in each mold through the joints and into the overflow grooves, and the molds are held in press for a sufficient time to effect the vulcanization.

l. A mold for a rubber repair patch with a tread portion and an upstanding flange, the mold comprising laterally separable parts having a recess corresponding in form to the tread and lying partly in the top face of each of the laterally separable parts, one of the laterally separable parts having a convex projection and the other having a concave recess and having its face meeting the bottom of the recess in the top face at a sharp edge, the projection and recess being spaced apart by the amount required for the upstanding flange, means for holding together the laterally separable parts, and a top plate through which pressure is applied for forcing material throughout the mold, substantially as described.

2. A mold for a rubber repair patch with a tread portion and an upstanding flange, the mold comprising laterally separable parts of easily machined material, one of the separable parts having a convex projection and the other having a concave recess the face of which terminates at its upper margin in a sharp edge, the portion which forms the sharp edge being formed of material capable of holding an edge, the projection and recess being spaced apart to correspond in form to the upstanding flange, means for holding together the laterally separable parts, and a top plate cooperating with the laterally separable parts to form a recess for the tread in such manner that pressure may be applied through the top plate for forcing material throughout the a tread portion and an upstanding flange,"

the mold comprising laterally separable parts, one of the separable parts having a convex projection with a shoulder near the bottom thereof, and the other having a concave recess, the projection and recess being spaced apart to correspond in form to the upstanding flange and the shoulder defining the margin of the flange, means for holding together the laterally separable parts, and a top plate cooperating'with the laterally separable parts to form a recess for the tread in such manner that pressure may be applied through the top plate for forcing material throughout the mold, substantially as described. f

4. A mold for a rubber repair patch with a tread portion and an upstanding flange, the mold comprising laterally separable parts having a recess corresponding in form to the tread and lying partly in the top face of each of the laterally separable parts, one of the laterally separable parts having a projection convex in both vertical and horizontal sections and the other having a recess concave in both vertical and horizontal sections and having its face meeting the bottom of the recess in the top face at a sharp edge,

lthe projection and recess being spaced apart.

by the amount required for the upstanding flange, a bottom plate, engaging means between the bottom plate and eachy of the laterally separable parts, and a top plate ing material throughout the mold, substantially as described.

5. A mold fora rubber repair patch with a tread portion and an upstanding flange,

the mold comprising laterally separable' parts of easily lmachined f material, one of the separable parts having a projection convex in both vertical and horizontal sections and the other having a recess' concave vin both vertical and horizontal sections the face of which terminates at its upper margin in a sharp edge, the portion which forms l kthrough which pressure is 'applied for forcmaterial throughout the mold, substantially Y as -`described...

6. A mold for arubberrepair patch with a tread portion and an upstanding flange, the mold comprising laterally separable parts, one of the separable parts having a convex projection with a shoulder near the bottom thereof and the other having a concave recess, the projection and recess being spaced apart to correspond in form tothe upstanding flange and the shoulder defining the margin of the flange, a bottom plate, engaging means between the bottom plate and each of the laterally separable parts,

and a top plate cooperating with the later-` ally separable parts to form a recess `for the v tread in such manner that pressure may be applied through the top platefor forcingl material throughout the mold, substantially 

